spring aop环绕通知

<bean id="hello" class="org.spring.Hello"></bean>
    <bean id="log" class="org.spring.Log"></bean>
    <aop:config>
        <aop:aspect id="log" ref="log">
            <aop:pointcut id="pt" expression="execution(public void org.spring.Hello.aop())"></aop:pointcut>
            <aop:around method="around" pointcut-ref="pt"></aop:around>
        </aop:aspect>
    </aop:config>

 public Object around(ProceedingJoinPoint joinPoint){
        Object[] args = joinPoint.getArgs();
        Object proceed = null;
        try {
            System.out.println("around前置通知");
            proceed = joinPoint.proceed(args);
            System.out.println("后置");
        } catch (Throwable throwable) {
            System.out.println("异常");
            throwable.printStackTrace();
        }finally {
            System.out.println("最终");
        }
        return proceed;
    }